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Research ArticleArticles

Investigation of Fungicidal Properties of the Tree Growth Regulator Paclobutrazol to Control Apple Scab

Ryan A. Blaedow, William R. Chaney, Paul C. Pecknold and Harvey A. Holt
Arboriculture & Urban Forestry (AUF) March 2006, 32 (2) 67-73; DOI: https://doi.org/10.48044/jauf.2006.009
Ryan A. Blaedow
Ryan A. Blaedow (corresponding author), Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, U.S.,
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  • For correspondence: [email protected]
William R. Chaney
William R. Chaney, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, U.S.
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Paul C. Pecknold
Paul C. Pecknold, Department of Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.
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Harvey A. Holt
Harvey A. Holt, Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, U.S.
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    Figure 1.

    Average annual terminal shoot growth (cm) of ‘Snow Drift’ crabapple. Treatments consisted of a control [basal drench with 500 mL (15 fl oz) of water], 1 × PBZ [a basal drench with PBZ, 0.79 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water], or 2 × PBZ [a basal drench with PBZ, 1.58 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water]. Observations were made 210 days (A), 428 days (B), and 800 days (C) after treatment application (1 April 2002). Lower-case letters indicate significant differences between means for each evaluation date (α = 0.05).

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    Figure 2.

    Average annual terminal shoot growth (cm) of ‘Hopa’ crabapple. Treatments consisted of a control [basal drench with 500 mL (15 fl oz) of water], 1 × PBZ [a basal drench with PBZ, 0.79 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water], or 2 × PBZ [a basal drench with PBZ, 1.58 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water]. Observations were made 210 days (A), 428 days (B), and 800 days (C) after treatment application (1 April 2002). Lower-case letters indicate significant differences between means for each evaluation date (α = 0.05).

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    Figure 3.

    Average incidence of apple scab (%) on shoot leaves of ‘Snow Drift’ crabapple. Treatments consisted of a control [basal drench with 500 mL (15 fl oz) of water], 1 × PBZ [a basal drench with PBZ, 0.79 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water], or 2 × PBZ [a basal drench with PBZ, 1.58 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water]. Observations were made 75 days (A), 428 days (B), and 800 days (C) after treatment application (1 April 2002). Lower-case letters indicate significant differences between means for each evaluation date (α = 0.05).

  • Figure 4.
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    Figure 4.

    Average incidence of apple scab (%) on shoot leaves of ‘Hopa’ crabapple. Treatments consisted of a control [basal drench with 500 mL (15 fl oz) of water], 1× PBZ [a basal drench with PBZ, 0.79 g a.i. diameter cm−1, in 500 mL (15 fl oz) of of water], or 2 × PBZ [a basal drench with PBZ, 1.58 g a.i. diameter cm−1, in 500 mL (15 fl oz) of water]. Observations were made 75 days (A), 428 days (B), and 800 days (C) after treatment application (1 April 2002). Lower-case letters indicate significant differences between means for each evaluation date (α = 0.05).

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    Figure 5.

    Average annual terminal shoot growth (cm) of ‘Indian Magic’ crabapple saplings 64 days after planting (22 June 2002). Treatments consisted of (1) control; (2) soil drench with PBZ (0.79 g a.i. diameter cm−1) at time of planting; (3) foliar application of propiconizole (0.016% by volume) every 2 weeks beginning 4 days after budbreak (2 May 2002); (4) foliar application of PBZ (0.02 g mL−1) 4 days after budbreak (2 May 2002); (5) foliar application of PBZ (0.02 g mL−1) 4 days after the first heavy infection period (15 May 2002); and (6) foliar application of propiconizole (0.016% by volume) 4 days after the first heavy infection period (15 May 2002). Lower-case letters indicate significant differences between means (α = 0.05).

  • Figure 6.
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    Figure 6.

    Average incidence of apple scab (%) on ‘Indian Magic’ crabapple sapling leaves 53 days after planting (11 June 2002). Treatments consisted of (1) control; (2) soil drench with PBZ (0.79 g a.i. diameter cm−1) at time of planting; (3) foliar application of propiconizole (0.016% by volume) every 2 weeks beginning 4 days after budbreak (2 May 2002); (4) foliar application of PBZ (0.02 g mL−1) 4 days after budbreak (2 May 2002); (5) foliar application of PBZ (0.02 g mL−1) 4 days after the first heavy infection period (15 May 2002); and (6) foliar application of propiconizole (0.016% by volume) 4 days after the first heavy infection period (15 May 2002). Lower-case letters indicate significant differences between means (α = 0.05).

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Arboriculture & Urban Forestry (AUF): 32 (2)
Arboriculture & Urban Forestry (AUF)
Vol. 32, Issue 2
March 2006
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Investigation of Fungicidal Properties of the Tree Growth Regulator Paclobutrazol to Control Apple Scab
Ryan A. Blaedow, William R. Chaney, Paul C. Pecknold, Harvey A. Holt
Arboriculture & Urban Forestry (AUF) Mar 2006, 32 (2) 67-73; DOI: 10.48044/jauf.2006.009

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Investigation of Fungicidal Properties of the Tree Growth Regulator Paclobutrazol to Control Apple Scab
Ryan A. Blaedow, William R. Chaney, Paul C. Pecknold, Harvey A. Holt
Arboriculture & Urban Forestry (AUF) Mar 2006, 32 (2) 67-73; DOI: 10.48044/jauf.2006.009
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Keywords

  • Apple scab
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